IG DESMOPIIYLLUM. 



tlio costiB covered with very fine sharp granuhitions. Tlie eolumell.a 

 of the recent sjiecies is also niucli k^ss developed tlian in the fossil, 

 and the pali more slender and delicate. 



Among- the varieties, those witli large and prolonged primary costa? 

 (Plate II., figs. 4 and 5) appeared to present therewith good specific 

 characters, until a large specimen was found which had enlarged 

 and projecting primary costa) until about half grown, and then sud- 

 denly changed to the form with equal costal. One mutilated sj^ecimen 

 has the primary costa^ prolonged into horn-like apjoendages as long 

 as one fourth the diameter of the calicle, and surmoimted with a 

 smaller prong, directed upwards. (Plate V., figs. 9 and 10.) 



The polyp of a large living specimen dredged in 115 fathoms, oft" 

 the Tortugas, was whitish, with brown stripes between the pali and on 

 the secondary septa. The tentacles were club-shaped, short, placed in 

 the depressions between the septa and the jiali. 



On the Florida side of the channel most of the specimens were 

 innnature. Until half grown the wall forms a regular cone of very 

 large aperture (about 110'); at a later period it becomes flatter and 

 saucer-shaped. 



One single sj^ecimen was obtained living, and was also the largest; 

 13.5 millimeters in diameter. 



Off Conch Reef, in fiO fetlioms. 

 Off Alligator Reef, in 113 fatlioais. 

 Off Tortugas, in 115 tathoms. 

 Off Chorrera (Cuba), in 270 fathoms. 

 Off Rebecca Cliannel, in 290 fathoms. 

 Off Marquesas, in 29S fathoms. 

 Off Boca Grande, in 327 fathoms. 



DESMOPHYLLUM EiinBO. 



Desmophylluni Cailleti Ducii. & JIicii. 

 T)(v»iojj/ii/!lum CdiUeli Ducri. & Micii. Siippl. Mem. Corah, 1864. 



Six fine living specimens of this coral were ()l)taiued in 315 

 fatlionis, off the Double-Headed Shot Keys. They agree with the 

 definition of the above species, but arc more elongated and more 

 contracted at the l)ase than the figure of those authors. Wall 

 and septa are very thin and fragile, and the whole coral resembles 

 lihizolrochus fnii/ili-s A'ery much. The largest specimen is 23 mil- 

 limeters in height, and 13 in diameter at the calicle. 



